* {
margin: 0;
padding: 0;
}
html，body{
    width: 100%;
    height: 100%;
}

ol, ul, li {
list-style: none;
}
a {
	text-decoration: none;
    color: #000;
}
img{
	display:block ;
	border: 0;
}
input,textarea{
	outline: none;
}
/* 万能清除法 */
.bobo::after{
	content: "";
	display: block;
	clear: both;
	height: 0;
	width: 0;
	visibility: hidden;
}